EP1722032B1 - Procédé et dispositif pour humidifier une bande de matériau - Google Patents

Procédé et dispositif pour humidifier une bande de matériau Download PDF

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Publication number
EP1722032B1
EP1722032B1 EP06111312A EP06111312A EP1722032B1 EP 1722032 B1 EP1722032 B1 EP 1722032B1 EP 06111312 A EP06111312 A EP 06111312A EP 06111312 A EP06111312 A EP 06111312A EP 1722032 B1 EP1722032 B1 EP 1722032B1
Authority
EP
European Patent Office
Prior art keywords
pressure
liquid
moistening
nozzle
medium
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP06111312A
Other languages
German (de)
English (en)
Other versions
EP1722032A1 (fr
Inventor
Fabian Döling
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1722032A1 publication Critical patent/EP1722032A1/fr
Application granted granted Critical
Publication of EP1722032B1 publication Critical patent/EP1722032B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/008—Steam showers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G7/00—Damping devices

Definitions

  • the invention relates to a method for moistening a material web, in which a moistening medium is heated and ejected through at least one nozzle in the direction of the material web. Furthermore, the invention relates to a device for moistening a material web with a feed device for a moistening medium, a heating device and a nozzle arrangement, through which heated moistening medium can be ejected onto the material web.
  • Such a method and such a device are for example out DE-A-4233992 known.
  • Such a method and such a device are for example out DE-A-423 3 992 known.
  • a paper web is usually satin in the course of its manufacture, that is, passed through at least one nip, which is formed between two rollers. In this nip, the paper web is subjected to increased pressure and also to elevated temperature.
  • the aim of this process step also referred to as “calendering" is to slightly compress the paper web, but above all the surface properties of the paper web to desired To set values. This is especially true for the smoothness and gloss of the paper web.
  • Moisture application makes it easier to smooth the side of the paper web resting against a smooth and hard roller.
  • a wet application also takes into account the fact that due to the increased temperature in the nip part of the moisture is lost again and the paper web in the final stage should have a certain moisture content.
  • nozzle dampers Here is liquid, usually as well Water, ejected through nozzles and thereby atomized.
  • a jet humidifier With a nozzle moistener, relatively large amounts of moisture can be applied to the paper web.
  • controlling a jet humidifier is not easy. If the pressure ratios are not accurately matched to the respective nozzles, then too large or too small droplets result. Too large droplets can lead to water marks on fine, possibly even coated paper. If the droplets are too small, then they penetrate very quickly into the interior of the paper web, so that one can no longer carry out moisture-gradientcalendering. In addition, heat can be added to the paper web with a nozzle moistening only to a small extent.
  • the invention has for its object to improve the wetting of a web.
  • the humidifying medium By placing the humidifying medium under increased pressure, it will remain liquid even at an elevated temperature. For example, you can water in heated liquid form at a pressure of 50 bar to just over 260 ° C without it evaporates. Under this high pressure and temperature, the humidifying medium is then ejected. The liquid relaxes and partially evaporates. So it creates a mixture of steam and boiling liquid in the form of very fine droplets. This mixture is applied to the paper web, for example by means of nozzles.
  • an isenthalpe state change ie the enthalpy of the liquid does not change practically. Accordingly, not only a large amount of energy in the form of heat is introduced into the paper web, but also a sufficient amount of liquid. Since a liquid must be controlled, one can use known remplisstechniksdosierventile. Liquids are easier to dose than steam or gases. This results in a cost-effective approach.
  • the humidifying medium is heated to a temperature in the range of 120 ° C to 300 ° C. At such temperatures, the pressures are still manageable. From about 120 ° C, the advantages of the invention can be realized.
  • the moistening medium to a pressure of at least 10 bar, in particular to a pressure in the range of 10 to 100 bar.
  • the temperature is chosen only so high that the liquid still remains in liquid form. She relaxes then only when ejecting in the direction of the web.
  • the moistening medium is brought to the elevated pressure in liquid form and then heated.
  • This is a simple form of handling. It is easier to hold a liquid under pressure in liquid form than to re-compress a vapor to make it liquid.
  • a pump is used to generate the increased pressure.
  • a pump is a sophisticated component that comes in many forms. High pressures can easily be generated.
  • a ratio of liquid and gaseous phases of the humidifying medium by changing the pressure.
  • the water in which the water is below 50 bar, where it has an evaporation temperature of about 263 ° C, arise during the relaxation to the pressure of the ambient atmosphere (1 bar) about 35% finest high-temperature water particles and 65% saturated steam.
  • the exact conditions can be read off a t, s diagram of the water.
  • the liquid that has been supplied to the device brought to an increased pressure.
  • This has the advantage that the supply of the liquid can otherwise be left unchanged.
  • the pressure increase then causes the liquid to actually be in liquid form until it is ejected, even though it has been heated to a relatively high temperature by the heater.
  • the pressure increasing device is designed as a pump. With a pump, the pressure increase of a liquid is easily carried out.
  • the pressure increasing device is arranged between the supply device and the heating device. So you bring the liquid in liquid form to the increased pressure, so that you only need a relatively small volume for the liquid.
  • the pressure increasing device is controllable at least with regard to the height of an output pressure.
  • the ratio can be set, which adjusts to the ejection of the liquid between the vapor phase and the liquid phase in which the liquid is in droplet form. The higher the pressure, the more fluid is expelled.
  • the nozzle arrangement has at least one nozzle, which is associated with a valve.
  • the valve For example, the amount of liquid that is expelled can be controlled. Since still a liquid is controlled, the valve may be formed as a liquid metering valve. This allows a relatively simple construction.
  • the nozzle is associated with a pressure reduction stage. So you can set the pressure for each nozzle, with which the liquid is present. Thus, it is basically possible for each nozzle to adjust the ratio of vapor to liquid phase. So you can choose in a wide range, whether you want to apply more liquid or more steam on the web.
  • valve has the pressure reduction stage. This keeps the construction effort small.
  • valve is designed as a needle valve or pulse-width-modulated injection valve.
  • a relatively accurate metering of the liquid can be realized in a simple manner.
  • Fig. 1 schematically shows a device 1 for wetting a material web 2, which is passed under the device.
  • the device has a moisturizer 3, which may basically be designed as a conventional nozzle moistener. However, as will be explained below, it requires increased pressure resistance.
  • the moistener 3 has a multiplicity of schematically represented nozzles 4, which are directed in the direction of the material web 2.
  • Each nozzle 4 is connected to a valve 5, which is controllable via a control device 6 shown only schematically.
  • the control device 6 controls all valves, even if this is not shown for reasons of clarity. Due to the many valves 5, the material web can be moistened differently in zones across its direction of travel.
  • a liquid for example water
  • the supply device 7 may be a water connection of a supply network.
  • the supply device will still contain a treatment stage in which, for example, the water is descaled and / or adjusted to a predetermined pH.
  • the supply device 7 is connected to a pump 8, which brings the supplied liquid to an elevated pressure.
  • This pressure is preferably in the range of 10 to 100 bar.
  • the pump 8 thus acts as a pressure increasing device. It is controllable with regard to its output pressure by the control device 6.
  • the brought to the increased pressure liquid is supplied via a pressure-resistant line 9 to a heater 10.
  • the heater can heat the pressurized fluid without it evaporating. In other words, the liquid remains in liquid form.
  • the heater 10 is exemplified here as a heat exchanger, which is supplied via a supply line 11 thermal oil and discharged from the via a discharge line 12. But it is also possible to heat the heater with electrical energy or with gas.
  • the temperature of the liquid may be adjusted by the heater 10 in response to the pressure supplied by the pump 8.
  • the pressure supplied by the pump 8. can be at a pressure of 50 bar, the temperature of the liquid to about 260 ° C increase without the water evaporates.
  • each valve 5 may be formed as a liquid metering valve, for example as a needle valve or as a pulse-width-modulated injection valve.
  • the valve 5 has a pressure reducing function, so that the pressure of the liquid, which is supplied to a single nozzle 4, is still variable within certain limits.
  • a solid line shows curves of constant pressure
  • a dashed line shows curves of constant volume
  • dashed lines show curves of equal enthalpy.
  • a thicker solid line represents the temperature-entropy course of water.
  • a point A forms the boiling point.
  • the water here has a temperature of 100 ° C and a pressure of 1 bar.
  • the water is heated to a temperature of about 260 ° C under a pressure of 50 bar, then a point B is reached at which the water is just in the liquid phase. If you relax the water in this state to a pressure of 1 bar (dashed line with arrow), then results in a pressure of 1 bar, a proportion X of the liquid phase and a proportion Y of the saturated steam phase.
  • a pressure of 1 bar dashed line with arrow
  • the ratio of X to Y can be changed within certain limits.
  • the mass ratio of steam to liquid water can thus be adjusted very easily via the pressure in the heating device 10.
  • the boiling temperature is directly dependent on the set pressure.
  • a jet 15 is ejected, containing the finest water droplets in a steam atmosphere.
  • the jet 15 is thus designed as an aerosol mist. During the expansion of the water into the wet steam area, the droplets burst into the finest droplets due to the sudden evaporation.

Landscapes

  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Claims (13)

  1. Procédé pour humidifier une bande de matériau (2), dans lequel on chauffe un fluide d'humidification et on l'éjecte au moyen d'un moins une buse (4) en direction de la bande de matériau (2), caractérisé en ce que l'on chauffe le fluide d'humidification à une température comprise dans la plage de 120°C à 300°C et on le maintient sous forme liquide sous une pression accrue d'au moins 10 bars jusqu'à son éjection.
  2. Procédé selon la revendication 1, caractérisé en ce que l'on porte le fluide d'humidification à une pression comprise dans la plage de 10 à 100 bars.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'on porte le fluide d'humidification à la pression accrue sous forme liquide et on le chauffe ensuite.
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'on utilise une pompe (8) pour produire la pression accrue.
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'on règle une proportion entre la phase liquide et la phase gazeuse du fluide d'humidification par une variation de la pression.
  6. Dispositif pour humidifier une bande de matériau, avec un dispositif d'alimentation (7) pour un fluide d'humidification, un dispositif de chauffage (10) et un agencement de buses, par lequel le fluide d'humidification chauffé par le dispositif de chauffage (10) peut être éjecté sur la bande de matériau, caractérisé en ce que le dispositif de chauffage (10) chauffe le fluide d'humidification à une température comprise dans la plage de 120°C à 300°C et il comprend, entre le dispositif d'alimentation (7) et l'agencement de buses (4), un dispositif d'augmentation de la pression (8), qui maintient le fluide d'humidification sous forme liquide sous une pression accrue d'au moins 10 bars jusqu'à son éjection.
  7. Dispositif selon la revendication 6, caractérisé en ce que le dispositif d'augmentation de la pression (8) est réalisé sous forme de pompe.
  8. Dispositif selon la revendication 6 ou 7, caractérisé en ce que le dispositif d'augmentation de la pression (8) est disposé entre le dispositif d'alimentation (7) et le dispositif de chauffage (10).
  9. Dispositif selon l'un quelconque des revendications 6 à 8, caractérisé en ce que le dispositif d'augmentation de la pression (8) peut être commandé au moins en ce qui concerne la hauteur d'une pression d'éjection.
  10. Dispositif selon l'une quelconque des revendications 6 à 9, caractérisé en ce que l'agencement de buses (4) comprend au moins une buse, à laquelle une soupape (5) est associée.
  11. Dispositif selon la revendication 10, caractérisé en ce qu'un étage de réduction de pression est associé à la buse (4).
  12. Dispositif selon la revendication 11, caractérisé en ce que la soupape (5) comprend l'étage de réduction de pression.
  13. Dispositif selon l'une quelconque des revendications 10 à 12, caractérisé en ce que la soupape (5) est réalisée sous la forme d'une soupape à pointeau ou d'un injecteur modulé en largeur d'impulsion.
EP06111312A 2005-05-14 2006-03-17 Procédé et dispositif pour humidifier une bande de matériau Not-in-force EP1722032B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005022466A DE102005022466A1 (de) 2005-05-14 2005-05-14 Verfahren und Vorrichtung zum Befeuchten einer Materialbahn

Publications (2)

Publication Number Publication Date
EP1722032A1 EP1722032A1 (fr) 2006-11-15
EP1722032B1 true EP1722032B1 (fr) 2009-05-20

Family

ID=36781467

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06111312A Not-in-force EP1722032B1 (fr) 2005-05-14 2006-03-17 Procédé et dispositif pour humidifier une bande de matériau

Country Status (3)

Country Link
EP (1) EP1722032B1 (fr)
AT (1) ATE431873T1 (fr)
DE (2) DE102005022466A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5286348A (en) * 1991-10-16 1994-02-15 Valmet Automation (Canada) Ltd. Electronic flow modulated cross direction moisture actuator
DE10157689C1 (de) * 2001-11-24 2003-02-13 Voith Paper Patent Gmbh Verfahren und Vorrichtung zum Behandeln einer Faserstoffbahn
FI121674B (fi) * 2003-01-09 2011-02-28 Metso Paper Inc Menetelmä ja sovitelma liikkuvan paperi- tai kartonkirainan kostuttamiseksi

Also Published As

Publication number Publication date
DE502006003759D1 (de) 2009-07-02
DE102005022466A1 (de) 2006-11-16
ATE431873T1 (de) 2009-06-15
EP1722032A1 (fr) 2006-11-15

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